Materials for Civil and Construction Engineers (4th Edition)
4th Edition
ISBN: 9780134320533
Author: Michael S. Mamlouk, John P. Zaniewski
Publisher: PEARSON
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Textbook Question
Chapter 7, Problem 7.15QP
Why is it necessary to measure the air content of concrete at the job site rather than at the batch plant? Name one of the methods used to measure the air content of concrete.
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4) Why is it necessary to measure the air content of concrete at the job site rather than at the batch plant? Name one of the methods used to measure the air content of concrete.
Mixing and handling can significantly alter the air content of fresh concrete. Thus, field tests are
used to ensure that the concrete has the proper air content prior to placing. Air content can be
measured with the pressure, volumetric, gravimetric, or Chace air indicator methods. The pressure
method (ASTM C231) is widely used, since it takes less time that the volumetric method. The
pressure method is based on Boyle's law, which relates Figure 7.13 Consolidating concrete with
an internal vibrator. pressure to volume. A calibrated cylinder (Figure 7.14) is filled with fresh
concrete. The vessel is capped and air pressure is applied. The applied pressure compresses the air
in the voids of the concrete. The volume of air voids is determined by measuring the amount of
volume reduced by the pressure applied. This method is not valid for concrete made with
lightweight aggregates, since air in the aggregate voids is also compressed, confounding the
measurement of the air content of the…
Question 31
According to ASTM C33 Standard Specification for concrete Aggregates, what is the nominal maximum size aggregate?
% Retained by
Sieve Size
mass
# 4
95-100
# 3/8
70-90
# 3/4
30-65
1.5"
0-5
2"
O Sieve 1.5"
O Sieve 3/8"
Sieve 2"
O Sieve #4
Chapter 7 Solutions
Materials for Civil and Construction Engineers (4th Edition)
Ch. 7 - The design engineer specifies a concrete strength...Ch. 7 - A project specifies a concrete strength of 24.1...Ch. 7 - A project specifies a concrete strength of at...Ch. 7 - What is your recommendation for the maximum size...Ch. 7 - A concrete mix with a 3-in. slump, w/c ratio of...Ch. 7 - Prob. 7.6QPCh. 7 - You are working on a concrete mix design that...Ch. 7 - Design the concrete mix according to the following...Ch. 7 - Design the concrete mix according to the following...Ch. 7 - The design of a concrete mix requires 1173 kg/m3...
Ch. 7 - Prob. 7.11QPCh. 7 - Prob. 7.12QPCh. 7 - Students in the materials lab mixed concrete with...Ch. 7 - Students in the materials lab mixed concrete with...Ch. 7 - Why is it necessary to measure the air content of...Ch. 7 - What do we mean by curing concrete? What will...Ch. 7 - Discuss five different methods of concrete curing.Ch. 7 - Draw a graph showing the typical relation between...Ch. 7 - Why is extra water harmful to fresh concrete, but...Ch. 7 - Discuss the change in volume of concrete at early...Ch. 7 - Discuss the creep response of concrete structures....Ch. 7 - Prob. 7.22QPCh. 7 - On one graph, draw a sketch showing the typical...Ch. 7 - Using Figure 7.34, a. Determine the ultimate...Ch. 7 - Three concrete mixes with the same ingredients,...Ch. 7 - Three concrete mixes with the same ingredients,...Ch. 7 - Three 100 mm 200 mm concrete cylinders with water...Ch. 7 - Students in the materials class prepared three 4 ...Ch. 7 - Three 150 mm 300 mm concrete cylinders with water...Ch. 7 - Three 6 in. 12 in. concrete cylinders with water...Ch. 7 - A normal-weight concrete has an average...Ch. 7 - Discuss the significance of the compressive...Ch. 7 - What is the standard size of PCC specimens to be...Ch. 7 - Prob. 7.34QPCh. 7 - What is the purpose of performing the flexure test...Ch. 7 - What are the advantages of using a third-point...Ch. 7 - Consider a standard flexural strength specimen of...Ch. 7 - To evaluate the effect of a certain admixture on...Ch. 7 - To evaluate the effect of a certain admixture on...Ch. 7 - Prob. 7.40QPCh. 7 - Prob. 7.41QPCh. 7 - A normal-weight concrete has an average...Ch. 7 - Three batches of concrete were prepared using the...Ch. 7 - Three batches of concrete were prepared using the...Ch. 7 - Prob. 7.45QPCh. 7 - Prob. 7.46QPCh. 7 - Discuss two nondestructive tests to be performed...Ch. 7 - Discuss the concept of concrete maturity meters.Ch. 7 - Discuss four alternatives that increase the use...Ch. 7 - What is self-consolidating concrete? How are its...Ch. 7 - Prob. 7.51QPCh. 7 - Two 6 in. 12 in. concrete cylinders with randomly...Ch. 7 - Discuss the concept of high-performance concrete....Ch. 7 - Comparing PCC with mild steel, answer the...Ch. 7 - Prob. 7.55QP
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- Give any two examples of samples of different types of aggregates and note the different shapes,textures and sizes. Discuss how each type might affect the concrete mixture.arrow_forwardQuestion 30 According to ASTM C33 Standard Specification for concrete Aggregates, what is the maximum size aggregate? % Retained by Sieve Size mass # 4 95-100 # 3/8 70-90 #3/4 30-65 1.5" 0-5 2" O Sieve 2" O Sieve #4 O Sieve 1.5" O Sieve 3/8"arrow_forward4. A sample of fine aggregate weighs 501.2 g when SSD and 491.6 g when OD. The flask weighs 540.6 g when filled with water and 843.1 g when filled with the aggregate sample and water. Calculate the bulk specific gravity, apparent specific gravity, and percent absorption.arrow_forward
- a) Calculate the temperature of aggregates to produce fresh concrete having the sametemperature with the ambient temperature. Following data in Table 1 could be used:arrow_forward1. Explain why increasing the water content produces a weaker concrete.2. What is heat of hydration. 3. What is a temperature bar and why is it called temperature bar and for what purpose.arrow_forwardQ1 What moisture condition should the coarse and fine aggregate be in when mixing the concrete? A Unknown B Saturated C Oven Dry D Air Dried E SSD Q2 What restriction is placed on the size of a sample of a concrete batch? A 30 L B 15 L C 20 L D 10 L E 5 Larrow_forward
- Construction management please answer all the numbers. it will be a great help to me. thank you 1. The temperature in the room in which the concrete samples must be stored before testing should not be less than 23ºC. True or False. Explain 2. Maximizing the amount of aggregate, to a certain extent, improves the quality and economy of the mix. True or False. Explain 3.arrow_forwardHow can the percentage of absorption affect a concrete mix? if the percentage of absorption is 1.01%arrow_forward1. What are the most common applications for structural steel?2. What is the purpose of reinforcing steel in concrete? Discuss the qualities of reinforcing steel in general.3. Discuss briefly four kinds of heat treatment used to improve the characteristics of steel. What are the benefits of each kind of treatment?arrow_forward
- 2. Name and explain at least three different methods of curing. (MAKING AND CURING CONCRETE TEST SPECIMENS - Laboratory work)arrow_forwardA1-What is the bond strength between steel and concrete and how it can be calculated? 2-What is the segregation of fresh concrete? Give its reason and how to control it? V3- What are the advantages of concrete? 3- Discuss the effect of age and curing on the compressive strength of concrete. 5-What are the main purposes of using plasticizer admixtures? 6-What are the main techniques that should be used to reduce heat of hydration in massarrow_forwardIf the target slump of concrete is 30 mm, the maximum nominal size of the coarse aggregate is 25 mm, and the smallest nominal size is 9.5 mm, how much water is needed in the ordinary concrete mix? If the target slump of concrete is 85 mm, the maximum nominal size of the coarse aggregate is 37.5 mm, and the smallest nominal size is 9.5 mm, how much water is needed in the ordinary concrete mix? If the compressive strength of concrete at 28 days is 38 MPa and the concrete is non-air entrained, what is the water-cement ratio of the concrete mix? If the required compressive strength of air entrained concrete is 26 MPa, what is the water-cement ratio of the concrete mix? The required Class D concrete is 5 cubic ft. What is the volume of sand in the 5 cubic ft. concrete mix. Mixing water is one half of the amount of cement powder.arrow_forward
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